James swan



J. SWAN.

Making Auger Bits.

Patented July 14, 1868.

J AMES SWJTN, OF SEYMOUR, CONNECTICUT.

Letters Patent No. 80,027, dated July 14, 1868.

IMPROVEMENT IN THE MANUFACTURE OF NIGER-BITS.

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TO ALL WHOM ITMAY CONCERN:

'Be it known that I, JAMES SWAN, of Seymour, in the county of NewHavenpand State of Connecticut, have invented a new and usefulImprovement'in the Manufacture of Spur-Auger Bitsi and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable those skilled in the art to. make and use thesame, reference being had to the accompanying drawings, forming part ofthis specification.

' This invention relates to a new and useful improvement in themanufacture of spur-auger hits, and is designed to accomplish, by meansof dies, what has hitherto been done by hand with skilled labor.

In the accompanying sheet of drawings'- 7 Figure 1 is a view of abit-blank, constructed or formed in the usual way, and in a propercondition to be operated upon according to my invention.

Figure 2, a view of one of a pair of dies, by 'which the first processof my invention is carried out or accomplished. v

Figure 3, a view of a bit after being operated by said dies.

Figure 4, a view of one of a pair of dies by which the bit is completed.

Figure 5, a view of a bit completed according to my invention.

Similar letters of reference indicate corresponding parts.

A represents a bit-blank, which is crimped or twisted and upset at theend, in order to' have a sufliciency of metal at that part for theproper formation of'the lips, spurs, and screw.

This is accomplished by the ordinary process of manufacture,and'hitherto thc point a, lips I) b, and spurs c a, have been formed byhand and by skilled workmen, who, with peculiarly-shaped tools and manyblows of a hand-hammer of peculiar construction, form in a crude mannerthe parts above specified. v

I accomplish this result .by means of two die s, one of which, 13, isshown in fig. 2, an ordinary drop-prcss being used.

This die is formed with recessesor cavities e e, which preserve thematerial of which the spurs are formed. Cavities bil are also formed,which leave the blank, when pressed with the iipb and cutting-edge,between said lip and the screw-pointer, as shown in fig. 3.

These dies, in forming the parts above named, leave a flash, cl, allaround them, (see fig. 3,) and this is removed by dies, one of which, C,the female one, is shown in fig. 4.

After the removal of the flashf'the finishing is done in the usual orany proper way.

The bit, with the flash removed, is shown in fig. 5.

Theadvantage of this improvement consists in the accurate and uniformwork produced, which cannot be eg ualled by the ordinary hand process.

I do not claim forming the screw-lips and spurs o'f auger-hits by meansof dies and a drop-press, but what I claim asnew, and desire to secureby Letters Patent, is-

1. As my improvement of the dies B and C, the cavities e e, forpreserving the material for the spurs c c, as described.

2. As my improvement in auger-blanks, the projecting portions 1) c d, ofmetal, of which to form the lip and spur, of the form, and arrangedrelative to the screw-point and cutting-bit, as described.

' JAMES SWAN.

Witnesses:

CHAS. DOUGLASS, EDMUND H. Kmeurr.

